added draft for docker-listmonk

roles/docker-listmonk/templates/config.toml

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+[app]
+# Interface and port where the app will run its webserver.  The default value
+# of localhost will only listen to connections from the current machine. To
+# listen on all interfaces use '0.0.0.0'. To listen on the default web address
+# port, use port 80 (this will require running with elevated permissions).
+address = "localhost:9000"
+
+# BasicAuth authentication for the admin dashboard. This will eventually
+# be replaced with a better multi-user, role-based authentication system.
+# IMPORTANT: Leave both values empty to disable authentication on admin
+# only where an external authentication is already setup.
+admin_username = "listmonk"
+admin_password = "listmonk"
+
+# Database.
+[db]
+host = "localhost"
+port = 5432
+user = "listmonk"
+password = "listmonk"
+
+# Ensure that this database has been created in Postgres.
+database = "listmonk"
+
+ssl_mode = "disable"
+max_open = 25
+max_idle = 25
+max_lifetime = "300s"
+
+# Optional space separated Postgres DSN params. eg: "application_name=listmonk gssencmode=disable"
+params = ""

roles/docker-listmonk/templates/docker-compose.yml.j2

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+# NOTE: This docker-compose.yml is meant to be just an example guideline
+# on how you can achieve the same. It is not intented to run out of the box
+# and you must edit the below configurations to suit your needs.
+
+version: "3.7"
+
+x-app-defaults: &app-defaults
+  restart: unless-stopped
+  image: listmonk/listmonk:latest
+  ports:
+    - "9000:9000"
+  networks:
+    - listmonk
+  environment:
+    - TZ=Etc/UTC
+
+x-db-defaults: &db-defaults
+  image: postgres:13
+  ports:
+    - "9432:5432"
+  networks:
+    - listmonk
+  environment:
+    - POSTGRES_PASSWORD=listmonk
+    - POSTGRES_USER=listmonk
+    - POSTGRES_DB=listmonk
+  restart: unless-stopped
+  healthcheck:
+    test: ["CMD-SHELL", "pg_isready -U listmonk"]
+    interval: 10s
+    timeout: 5s
+    retries: 6
+
+services:
+  db:
+    <<: *db-defaults
+    container_name: listmonk_db
+    volumes:
+      - type: volume
+        source: listmonk-data
+        target: /var/lib/postgresql/data
+
+  app:
+    <<: *app-defaults
+    container_name: listmonk_app
+    depends_on:
+      - db
+    volumes:
+      - ./config.toml:/listmonk/config.toml
+networks:
+  listmonk:
+
+volumes:
+  listmonk-data: